exercises/Questions_2023/03_EX_if_else.ipynb

{
 "cells": [
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Exercise notebook 3 - If & Else "
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This exercise notebook complements the notebook of **Control structures - If & else statements**. <br> Use this [notebook](https://github.com/dtaantwerp/dtaantwerp.github.io/blob/53c91013df4514a943a9fad441fb5f28dc6f6bab/notebooks/04_W1_Wed_Control_structures_if_else.ipynb) for a complete explanation of the theory.\n",
    "\n",
    "Try to prepare the <ins>underlined exercises</ins> for the exercise session. "
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. <ins> Create a cell in which a statement is printed if the number is higher or equal to 10."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "nr = 11\n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. <ins> Create a piece of code that checks if the letter is in the string. <br> If it's in the string print 'found it!', if it's not in the string print 'it is not in the string'. <ins>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "letter = 'a'\n",
    "sentence = 'does this sentence contain the letter?'\n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3. <ins> Write a piece of code that prints \"they are the same\", if the variable x is equal to the variable of y."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = 3\n",
    "y = 6 * 2 / 3 -1\n",
    "\n",
    "# CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4. <ins> Write a piece of code that prints 'they are not the same', if the variable x is **not** equal to the variable of y."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = 3\n",
    "y = 6 * 2 / 3 \n",
    "\n",
    "# CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "5. <ins> A couple wants to go on holiday, but they cannot go over their budget of 1000 euros and they have a fear of flying. <br> Write a piece of code that:\n",
    "- <ins> checks if the cost is smaller or equal to the budget.\n",
    "- <ins> checks if the way_of_travel is not by 'aeroplane'.\n",
    "- <ins> if both conditions are met, print a statement that says 'Bon voyage!'\n",
    "- <ins> if one of these conditions is not met, print 'choose another destination'."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "budget = 1000\n",
    "way_of_travel = 'aeroplane'\n",
    "cost = 800\n",
    "\n",
    "#CODE HERE\n"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "6. <ins>Check if the guest is on the guestlist. If they are on the guestlist greet them, if not print a statement that tells them they are not invited.<ins>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [],
   "source": [
    "guestlist = ['Stephanie', 'John', 'Gordon', 'Roger', 'Elisabeth', 'Theresa', 'Sofie']\n",
    "guest = 'Sofie'\n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "7. <ins>Write a block of code that:\n",
    "- prints A if the score is higher than 90\n",
    "- prints B if it's higher than 60 \n",
    "- prints C if it's higher than 50.\n",
    "- In all other cases, F should be printed."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "score = 75\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "8. <ins> Write a block of code that asks the user for a season by using the input() function, and store this in a variable \"season\":\n",
    "<br>for each given season make sure that the start date for that season is printed:\n",
    "- summer starts on June 21st\n",
    "- fall starts on September 23rd\n",
    "- spring starts on march 20th\n",
    "- winter starts on December 21st.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [],
   "source": [
    "#CODE HERE\n"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "9. <ins> Change the previous block of code in such a way that it also accepts 'autumn' as a season. <br></ins> <br>\n",
    "Hint: use the 'or' operator. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 112,
   "metadata": {},
   "outputs": [],
   "source": [
    "#CODE HERE\n"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "10. <ins>Create a piece code that checks if the suspect is guilty. The person is only guilty if all three conditions are True. <br> If that's not the case, print 'innocent until proven otherwise'."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [],
   "source": [
    "means = True\n",
    "motive = False\n",
    "opportunity = True\n",
    "\n",
    "# CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "11. <ins> Recreate the code, but this time ask for the user's input to obtain the variables means, motive and opportunity. You get the first one as an example."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "means = input('Did the suspect have the means [yes/no]?').lower()\n",
    "motive = input().lower()\n",
    "opportunity = input().lower()\n",
    "\n",
    "#CODE HERE\n"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "12. Write a block of code that prints which generation someone belongs to based on their year of birth.\n",
    "- Gen Z = People born between 1997 and 2012\n",
    "- Millenials are people born between 1997 and 1980\n",
    "- Gen X are people born between 1980 and 1960\n",
    "- Baby boomers are people born between 1945 and 1960\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [],
   "source": [
    "#check in what decade someone was born\n",
    "year_of_birth = \n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "13. Look at the code before running it. Which statement(s) will be printed?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = 9\n",
    "\n",
    "if x <= 10 and x < 5:\n",
    "    print('statement 1')\n",
    "if x >= 8:\n",
    "    print('statement 2')\n",
    "elif x == 9:\n",
    "    print('statement 3')\n",
    "else:\n",
    "   print('statement 4')"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "14. Create a list of numbers (using range), then create an if else statement checking if variable a is in the list."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "# CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "15. Ask the user for their age and check if they are elligible for either a student discount (under 26 years old) or a senior discount (above 65).\n",
    "Hint: make sure that the input is interpreted as an integer by making use of int()."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [],
   "source": [
    "# CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "16. Check if a number is even or odd.\n",
    "\n",
    "    Hint: use the %-operator"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [],
   "source": [
    "nr = \n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "17. Write a piece of code that checks if the number ..\n",
    "- is divisible by three AND two\n",
    "- is only divisible by two\n",
    "- is only divisible by three\n",
    "- is not divisible by two nor three."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [],
   "source": [
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "18. Ask the age of three people and store them in three variables. Then only display the youngest one using an if-else statement."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: ''",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m~\\AppData\\Local\\Temp\\ipykernel_3472\\531397899.py\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mFred\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'How old are you, Fred?'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      2\u001b[0m \u001b[0mHarald\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'How old are you, Harald?'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      3\u001b[0m \u001b[0mSofie\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'How old are you, Sofie?'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      5\u001b[0m \u001b[1;31m#CODE HERE\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mValueError\u001b[0m: invalid literal for int() with base 10: ''"
     ]
    }
   ],
   "source": [
    "Fred = int(input('How old are you, Fred?'))\n",
    "Harald = int(input('How old are you, Harald?'))\n",
    "Sofie = int(input('How old are you, Sofie?'))\n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "19. Write a piece of code that checks if a letter is a vowel or not."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [],
   "source": [
    "vowels = 'aeiou'\n",
    "letter = 'b'\n",
    "\n",
    "#CODE HERE"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "20. Change the if-else statements below so that only the first statement is printed."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "This should be printed\n",
      "This should not be printed\n"
     ]
    }
   ],
   "source": [
    "number = 6\n",
    "\n",
    "if number < 9:\n",
    "    print('This should be printed')\n",
    "if number > 18:\n",
    "    print('This should not print')\n",
    "else:\n",
    "    print('This should not be printed')"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "base",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.9.13"
  },
  "orig_nbformat": 4,
  "vscode": {
   "interpreter": {
    "hash": "96e0a4d32f1918f770291244863a4a1e044b05d1a3b8d455e2e179187e01062a"
   }
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}